The Problem Pictures CD-ROM contains 184 colour photographs with activities for mathematics teaching. It is an unusual resource ? one that must be seen to be fully appreciated (examples can be found at http://www.problempictures.co.uk). The photographs are a mixture of images: attractive, unusual and/or puzzling. They challenge students to investigate and explain, or they might be the starting point for a survey or design ? all the stuff that Working Mathematically is made of! Questions and activities accompany each photograph; in addition, teachers can access a page giving hints, solutions and further information. Ideas connected with the pictures include symmetry, ratio, number patterns, spirals, games, packaging, mazes and sundials.